It'll drain the battery quite quickly compared to listening to music, so you may want to invest in an in-car charge (if they make one)

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They don't make one, but a plug-in that'll provide 5V at more than an amp ought to do it (the centre of the plug is POSITIVE - but check your mains supply box - my iRiver is in the car!). I must admit I can't see one instantly, though Maplin do a 4.5V one that would probably do the job OK.

I gather that ~4 hours is reasonable on a charge for watching video - which might be enough for you...

You can get a portable battery pack which is 4 AA batteries. I can't remember how long they last though, Mark was looking into that....

I don't see any reason why you can't get a charger that plugs into the cigarette lighter. I have a multi vault thingy that I used to used to plug a portable CD player into the car, so that may work....